Throughout the paper, we will simply refer to values of Definitions REF -REF  as stability radius measurements. Apart from satisfying the desired properties (i)-(iv) listed above, more constraints are imposed on the pairs. We quantify the \(L_2\)  and \(L_{\infty }\)  principal errors of the pairs following [1]}:
\(A^{(p+1)}_2&=||\tau ^{(p+1)}||_2 &\quad \text{and}\quad \tilde{A}^{(p)}_2&=||\tilde{\tau }^{(p)}||_2, \\A^{(p+1)}_{\infty }&=||\tau ^{(p+1)}||_{\infty }&\quad \text{and}\quad \tilde{A}^{(p)}_{\infty }&=||\tilde{\tau }^{(p)}||_{\infty },\) 
